MotoGP rookie Alex Rins has suffered two compressed vertebrae following an incident in the second day of post-season testing at Valencia.

Rins, who finished in 21st on his first official day of MotoGP testing on Tuesday, lost control of his GSX-RR bike at Turn 12 and hit the barrier in the first hour of Wednesday's running.

His bike's rear was completely destroyed, and he was taken away on a stretcher.

At the trackside medical centre, Rins was diagnosed with an injury to his T8 and T12 vertebrae and is set to be out of action for around a month, which will force him to miss an upcoming test planned next week at Jerez.

It marks Rins' second serious injury of the season, as he underwent surgery due to a broken collarbone during his Moto2 campaign, in which he finished third overall.

The Spaniard's teammate Andrea Iannone also crashed in the early stages of Wednesday's running, the Italian suffering his second incident on board the Suzuki in as many days.

His bike hit the barriers, which needed fixing, causing the session to be the red-flagged for an hour. However, Iannone escaped the incident unscathed and rejoined for the second half of the day.